Question: In Problem, what is the benefit-cost ratio of the project if the general inflation rate is 4% per year and the market value is negligible? The market interest rate (im) is 18% per year, and the annual savings are expressed in year-zero dollars.

Problem: A retrofitted space-heating system is being considered for a small office building. The system can be purchased and installed for $120,000, and it will save an estimated 300,000 kilowatt-hours (kWh) of electric power each year over a six-year period. Akilowatt-hour of electricity costs $0.10, and the company uses a MARR of 15% per year in its economic evaluations of refurbished systems. The market value of the system will be $8,000 at the end of six years, and additional annual operating and maintenance expenses are negligible. Use the benefit-cost method to make a recommendation.